Hello All:
Today I dug out an old McCoy .29 Sportsman circa. 1949 to get it broken in for use for OTS. I have a Sterling F-51 built for it.
The engine is "new" with a set of Bowman rings fitted. I ran it vey rich with a heavy 9x6 prop until 5 five ounce tanks had been run through it. I varied the speed from a blubbering 4 cycle to a blubbering two cycle. The engine now cold starts on the first flip. I have not run it wide open in a two cycle yet. I am saving that for in the air in case the engine decides to go from a four cycle to a two cycle then I may have some room for error.
Questions:
How well will this engine perform as a power source for an OTS?
What speeds may I expect with a 9x6 or a 10x6 prop?
Anybody have experiences with these old McCoy engines?
It did not like FAI fuel! It was much happier on a fuel containing 10% nitro. I sinned and used oil content of 14-14 synthetic and castor. All castor with a ringed engine may not be a good choice.
I used a McCoy Redhead .35 yesterday in a Sterling F-51 and it was a joy to use. I have never used a McCoy before and this engine was really great. I will go out on a limb and say that it was a better running engine than the Fox .35 Stunts that I have used in the past. It started on the first flip, held a perfect 4 cycle and broke into a two cycle during manouvers. It was very smooth running!
Yes, I know that there are better choices but the cool factor in OTS has to be worth the trouble! Lol I can always resort to using my very old Fox .35 engines but everybody has one of those!
Suggestions or comments?
Tia,
Frank McCune